#include<bits/stdc++.h>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");

int vec[100000],n;
int vals[100000];
int pre[1000000];

void read()
{
    in>>n;
    for(int i=0; i<n; i++)
        in>>vec[i];
}

void solve()
{
    int maxx=-1;
    int maxindex=0;
    for(int i=0; i<n-1; i++)
    {
        for(int k=i+1; k<n; k++)
        {
            if(vec[i]<vec[k])
            {
                if(vals[i]+1>vals[k])
                {
                    vals[k]=vals[i]+1;
                    pre[k]=i;
                }
                if(maxx<vals[k])
                {
                    maxx=vals[k];
                    maxindex=k;
                }
            }
        }
    }
    vector<int> result;
    while(maxindex)
    {
        result.push_back(vec[maxindex]);
        maxindex=pre[maxindex];
    }
    out<<maxx+1<<endl;
    for(int i=maxx; i>=0; i--)
        out<<result[i]<<" ";
}


int main()
{
    read();
    solve();
}